I think that most of such hopefuls, at the end of an honest self-assessment would find themselves merely qualified for a "passive government"---the one made up of armchair critics of "what should be done, and what hasn't been done".
Equipped with the jargon picked up from political circus as lavishly presented by the media, even if they got elected they would suddenly find themselves face to face with the reality of politics in which all that eloquence doesn't help at all.
Namely, politics doesn't merely consist of yapping convincingly, but there are many of those interest groups to cater to, not even to mention all the pressure from the public not always coinciding with the pressure from those "above", and those "on the side" meaning opposition whose job it is to make their life miserable.
Many candidates, including those running for presidency may have some pretty solid ideas what they will do differently if elected. But that is never that simple, because there is something like political routine with all players trying to prevent any newcomer to rock the boat. So, before they know it, they are dancing to someone else's music, and now in a jam of having to explain to the public why those promises of the election time cannot be kept.
The universal excuse is always: "The previous administration left a big mess and it will take time for it to be cleaned, so let's all exercise some patience".
Life in politics hardly ever matches the picture created by the media, who merely get some unimportant pieces to play with and to fabricate their interpretation of them according to their political preferences, or the one of those paying for such interpretation.
Much of political dynamics has to do with that unfortunate "classified" information, which is the cornerstone of the joke called democracy. Namely, people are only allowed to know some fragments---especially when it's about foreign chess game.
So, all in all, I think people of the public have many decent ideas about running an office---but they should be ready for some big surprises there.